The table shows the postage rates for posting mail locally and overseas.
Mass |
Local Postage |
Overseas Postage |
First 90 g |
45¢ |
75¢ |
Every additional 10 g |
20¢ |
30¢ |
Ethan paid $4.35 for posting a package overseas. What was the greatest possible mass of the package that Ethan posted?
$1 = 100¢
$4.35 = 4.35 x 100 = 435¢
Amount that Ethan paid for the additional sets of 10 g for the overseas package
= 435 - 75
= 360¢
Number of sets of 10 g that Ethan paid for the overseas package
= 360 ÷ 10
= 36
Mass of 36 sets of 10 g for the overseas package
= 36 x 10
= 360 g
Greatest possible mass of the overseas package
= 90 + 360
= 450 g
Answer(s): 450 g